CN111676830A - Jack lifting equipment and lifting method thereof - Google Patents
Jack lifting equipment and lifting method thereof Download PDFInfo
- Publication number
- CN111676830A CN111676830A CN202010632836.9A CN202010632836A CN111676830A CN 111676830 A CN111676830 A CN 111676830A CN 202010632836 A CN202010632836 A CN 202010632836A CN 111676830 A CN111676830 A CN 111676830A
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- trolley
- jack
- track
- frame
- lifting
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A jack lifting device and a lifting method thereof comprise a walking bracket system (1), a translation system (2) arranged at the outer side of the walking bracket system, and a lifting system (3) connected with the translation system; the walking support system comprises a supporting frame (11) which is formed by welding and connected by metal members and is in a three-dimensional rectangular shape, four upright rods (12) welded in four corners of a bearing frame and universal wheels (13) arranged at the bottom ends of the upright rods; the translation system comprises a rectangular track frame (21) arranged on the outer side of the support frame and a translation trolley (22) which is arranged in the rectangular track frame and can reciprocate along an upper track and a lower track. The invention effectively solves the problems of inconvenient positioning and difficult operation of the jack in the overhead operation in the prestressed tensioning construction process of the upper structure of the bridge, and has stable structure, simple and convenient operation and safe construction.
Description
Technical Field
The invention relates to the technical field of highway engineering construction, in particular to novel jack lifting equipment suitable for bridge superstructure prestress tension construction and a lifting method thereof.
Background
With the continuous increase of bridge span, the use of prestress in bridge structure is more and more extensive. In the traditional prestress tensioning construction process, a simple lifting appliance such as a steel wire rope or a nylon rope is adopted for lifting and conveying a jack, the problem of swing and rotation often occurs in the jack positioning process, so that the jack is difficult to install in position in the tensioning operation process, meanwhile, if the applied prestress tonnage is large, the weight of the jack is increased along with the jack, two workers are required for cooperative operation in the jack positioning construction operation at the tensioning position, and the large potential safety hazard exists.
Disclosure of Invention
The invention aims to provide jack lifting equipment which is simple and convenient to operate, safe to use and capable of being used circularly, so that a jack can be quickly and smoothly positioned, the construction efficiency is improved, and the construction safety is ensured. The invention also provides a lifting method of the equipment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a jack lifting device comprises a walking bracket system, a translation system arranged outside the walking bracket system, and a lifting system connected with the translation system;
the walking support system comprises a supporting frame, four vertical rods and universal wheels, wherein the supporting frame is formed by welding and connecting metal members and is in a three-dimensional rectangular shape;
the translation system comprises a rectangular track frame arranged on the outer side of the support frame and a translation trolley which is arranged in the rectangular track frame and can reciprocate along an upper track and a lower track; the top frame and the bottom frame of the rectangular track frame are provided with track grooves with opposite notches; the translational trolley comprises a rectangular frame, upright rollers respectively arranged at two sides of the outer sides of an upper beam and a lower beam of the rectangular frame, and flat rollers respectively arranged at the top ends and the bottom ends of upright columns at two sides of the rectangular frame; the vertical roller and the horizontal roller are arranged in the track groove of the rectangular track frame; the middle parts of an upper beam and a lower beam of the rectangular frame are welded with outwards extending connecting clamping plates;
the lifting system comprises a base, a vertical threaded column arranged on the base, an internal threaded sleeve sleeved on the vertical threaded column, a locking rod inserted on the internal threaded sleeve, a hand wheel sleeved on the vertical threaded column and positioned above the internal threaded sleeve, a thrust ball bearing sleeved on the vertical threaded column and capable of propping against a hub of the hand wheel, a bottom plate welded on the inner side of the base, two main rails arranged on the bottom plate and with opposite notches, an outer trolley arranged in the main rails and capable of walking in a reciprocating manner, and an inner trolley arranged in the outer trolley and capable of walking in a reciprocating manner; the outer trolley comprises a rectangular frame type carriage, a front outer trolley wheel shaft and a rear outer trolley wheel shaft which are arranged at the bottom of the carriage, and outer trolley wheels which are arranged at two ends of the outer trolley wheel shaft, wherein carriage frames at two sides of the carriage are channel steel parts with opposite notches, the outer trolley wheels are assembled in a trolley main rail and reciprocate along the main rail, and an outer trolley limiting screw is arranged at the front end of the carriage; the inner trolley comprises a trolley body, a front inner trolley wheel shaft and a rear inner trolley wheel shaft which are arranged at the bottom of the trolley body, and inner trolley wheels which are arranged at two ends of the inner trolley wheel shaft, the inner trolley wheels are assembled in grooves of carriage frames at two sides of a carriage of the outer trolley and reciprocate along the carriage frames, and a jack support rotating shaft is arranged at the top of the front end of the trolley body; a lengthened track limiting screw is arranged at the bottom of the lengthened track; the internal thread sleeve is welded with an upper connecting clamping plate and a lower connecting clamping plate of the translation system, and the front end of the bottom plate is provided with an anti-derailment blocking bolt.
Furthermore, the outer end of the main track is connected with a lengthened track which can rotate along a hinge shaft through the hinge shaft; the bottom plate comprises a main bottom plate and a middle connecting plate which are laid at intervals and used for installing the main track, the main bottom plate is provided with a lap joint section extending out of the main track, the middle connecting plate is positioned at the bottom of the outer end of the main track, and the lengthened track is fixed on the lap joint section through a connecting screw when the lengthened track rotates to lean against the main track back to back; an additional connecting plate is attached to the bottom of the lengthened track through a connecting screw and used for connecting and stabilizing the two lengthened tracks when the lengthened tracks are unfolded.
Furthermore, a supporting steel frame is additionally welded inside the top surface of the supporting frame.
The lifting method of the jack lifting equipment comprises the following steps:
s1, when the prestressed tensioning construction of the upper structure of the bridge is carried out, a jack oil pump to be used is installed on an oil pump support welded on the outer side of a supporting frame, a jack is installed on a jack supporting rotating shaft of a lifting system through a jack connecting frame with a top plate, universal wheels of a walking support system are placed on the bridge, a translation system and the lifting system are suspended on the outer side of the bridge, and a bottom plate, a rail, a trolley and a supported jack which are installed by depending on the bottom plate extend to the lower side of the bridge;
s2, pushing the walking support system, enabling the universal wheels to rotate, and enabling the whole lifting equipment to run to a construction position along the bridge surface;
s3, pushing the translation trolley to move along the rectangular track frame, and performing primary adjustment on the position of the jack;
s4, rotating a hand wheel to drive the vertical threaded column to descend, placing the jack placed on the jack support rotating shaft downwards, meanwhile, rotating the outer trolley, the inner trolley, the main track and the bottom plate through the vertical threaded column, the threaded sleeve and the thrust ball bearing to roughly adjust the angle of the jack, and then screwing a locking rod to lock the vertical threaded column;
s5, pushing the outer trolley to move along the main track according to the distance between the jack and the tensioning position, and pushing the inner trolley to further enlarge the movement range of the jack, wherein the carriage of the outer trolley is used as the track of the inner trolley; the precision adjustment of the jack angle can be carried out through the jack support rotating shaft and the jack connecting frame;
and S6, repeating the steps to enable the jack to be aligned to the anchorage device at the tensioning position, and completing the lifting and positioning work of the jack.
In the step S5, the lengthened rail is rotated along the hinge shaft, and the lengthened rail is unfolded to splice the lengthened rail with the main rail, so as to lengthen the rail on which the outer trolley travels; after the lengthened tracks are spliced with the main track, the additional connecting plate is taken down and transversely connected to the outer ends of the two lengthened tracks, and the two ends of the additional connecting plate are respectively connected and fixed with the outer ends of the lengthened tracks through connecting screws, so that the lengthened tracks are prevented from being scattered.
The invention conveys the jack to the construction tensioning position through the linkage action of each system, improves the prestress tensioning construction efficiency and effectively solves the problem that the jack is difficult to install in place. The lifting equipment provided by the invention is stable in structure and safe and reliable to use.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a top view of the present invention;
figure 5 is a schematic structural view of the pole;
FIG. 6 is a schematic structural view of the translation carriage;
FIG. 7 is an exploded view of the lift system;
FIG. 8 is a schematic side view of the lifting jack of the present invention;
fig. 9 is a schematic bottom view of the lifting jack of the present invention.
Detailed Description
The present invention will now be further described with reference to the accompanying drawings and examples, wherein like element numbers represent like elements of the invention. The invention is suitable for lifting the jack of the prestressed tension construction of the bridge superstructure, but is not limited to the jack and can also be used in the construction process of other engineering types.
As shown in fig. 1 to 4, a jack lifting device includes a walking frame system 1, a translation system 2 installed outside the walking frame system, and a lifting system 3 connected to the translation system.
As shown in fig. 1 to 5, the traveling support system 1 includes a support frame 11, which is welded by metal members and has a three-dimensional rectangular shape, four upright posts 12 welded in four corners of a bearing frame, and universal wheels 13 mounted at bottom ends of the upright posts. The supporting steel frames 111 which are criss-cross welded inside the top surface of the supporting frame 11 to increase the strength and rigidity of the supporting frame. The supporting frame 11 is formed by welding square steel pipes. The pole setting 12 also adopts the square steel pipe preparation, equidistant processing mounting hole 121 and the spacing steel sheet 122 that the configuration pole setting can pass on the pole setting weld spacing steel sheet on braced frame 11, and the pole setting can reciprocate in the square hole on spacing steel sheet, inserts the mounting hole that is located spacing steel sheet bottom with bail 123, realizes the location of pole setting. The adjustment of the mounting height of the support frame 11 is achieved by adjusting the insertion hole positions of the staples on the upright posts.
As shown in fig. 1 to 4 and 6, the translation system 2 includes a rectangular track frame 21 disposed outside the support frame, and a translation trolley 22 mounted in the rectangular track frame and capable of reciprocating along the upper and lower tracks. The top frame and the bottom frame of the rectangular track frame 21 are provided with track grooves with opposite notches. The translation trolley comprises a rectangular frame 221, upright rollers 222 respectively arranged on two outer sides of an upper beam and a lower beam of the rectangular frame, and flat rollers 223 respectively arranged at the top ends and the bottom ends of upright columns on two sides of the rectangular frame. The vertical roller 222 and the horizontal roller 223 are disposed in the rail groove of the rectangular rail frame. The middle parts of the upper beam and the lower beam of the rectangular frame are welded with the connecting clamping plates 224 which extend outwards.
As shown in fig. 1 to 4 and 7, the lifting system 3 includes a base 31, a vertical threaded column 32 installed on the base, an internal threaded sleeve 33 sleeved on the vertical threaded column, a locking rod 331 inserted into the internal threaded sleeve, a hand wheel 333 sleeved on the vertical threaded column and located above the internal threaded sleeve 33, a thrust ball bearing 332 sleeved on the vertical threaded column and capable of propping against a hub of the hand wheel, a bottom plate welded to the inner side of the base, a main rail 35 installed on the bottom plate and having two notches opposite to each other, an outer trolley 36 installed in the main rail and capable of reciprocating, and an inner trolley 37 installed in the outer trolley and capable of reciprocating. The internally threaded sleeve 33 comprises a sleeve jacking 334 and a sleeve bottom lining 335, the thrust ball bearing 332 is assembled in the sleeve jacking 334, and the top surface of the thrust ball bearing is contacted with the bottom surface of the hub of the hand wheel 333. The outer trolley comprises a rectangular frame type carriage 361, a front outer trolley wheel shaft 362 and a rear outer trolley wheel shaft 362 which are arranged at the bottom of the carriage, and outer trolley wheels 363 which are arranged at two ends of the outer trolley wheel shaft, wherein carriage frames at two sides of the carriage are channel steel parts with opposite notches, the outer trolley wheels are assembled in a trolley main rail and reciprocate along the main rail, and the outer side face of the front end of the carriage is provided with an outer trolley limiting screw 364. The inner trolley 37 comprises a trolley body 371, a front inner trolley wheel shaft 372 and a rear inner trolley wheel shaft 372 which are arranged at the bottom of the trolley body, and inner trolley wheels 373 which are arranged at two ends of the inner trolley wheel shafts, wherein the inner trolley wheels are assembled in notches of box frames at two sides of a box of the outer trolley and reciprocate along the box frames, and a jack support rotating shaft 374 which can rotate freely is arranged at the top of the front end of the trolley body. The bottom of the lengthened track 30 is provided with a lengthened track limiting screw 301. The internal thread sleeve 33 is welded with an upper connecting clamping plate 224 and a lower connecting clamping plate 224 of the translation system, an anti-derailing blocking bolt 39 is installed at the front end of the bottom plate, the outer trolley 36 is limited in the main track 35 through the anti-derailing blocking bolt 39, and the inner ends of the main track and the bottom plate are welded with the bottom of the base 31. The vertical threaded post 32 is anchored to the internally threaded sleeve 33 by rotating the hand wheel 333 and the thrust ball bearing 332.
The outer end of the main track 35 is connected with an elongated track 30 which can rotate along a hinge shaft through the hinge shaft 38; the base plate comprises a main base plate 341 and a middle connecting plate 342 which are laid at intervals and used for installing the main track, the main base plate 341 is provided with an overlapping section 343 extending out of the main track, the middle connecting plate 342 is positioned at the bottom of the outer end of the main track, and when the lengthened track 30 rotates to be attached to the main track back to back, the lengthened track is fixed on the overlapping section 343 through a connecting screw 301; an additional attachment plate 344 is attached to the bottom of the elongate rail by attachment screws for connecting and stabilizing the two elongate rails when they are deployed.
The invention can be used for installing the jack on a jack supporting rotating shaft of a lifting system, driving the lifting system to a construction position through a walking bracket system, primarily adjusting the position of the jack by utilizing a translation system, and accurately conveying the jack to a construction tensioning position by utilizing the lifting system. As shown in fig. 1 to 9, the specific lifting method is as follows:
s1, when the prestressed tensioning construction of the upper structure of a bridge is carried out, a jack oil pump 4 to be used is installed on an oil pump support 4a welded on the outer side of a supporting frame 11, a jack 5 is installed on a jack supporting rotating shaft 374 of a lifting system 3 through a jack connecting frame 5a with a top plate, universal wheels 13 of a walking support system 1 are placed on the bridge 6, a translation system 2 and the lifting system 3 are suspended on the outer side of the bridge, and a bottom plate, a rail, a trolley and a supported jack which are installed by the bottom plate extend to the lower side of the bridge; the jack support rotating shaft 374 is a rotatable component, the jack connecting frame 5a and the jack support rotating shaft are connected with each other, and the connection mode can be selected from various simple and stable connection modes, wherein the connection mode of the embodiment is to connect the bottom frame of the jack connecting frame with two ends of a connecting rod which horizontally penetrates through the jack support rotating shaft;
s2, pushing the walking support system 1, enabling the universal wheels 13 to rotate, and enabling the vehicle to run to a construction position along a bridge surface;
s3, pushing the translation trolley 22 to move along the rectangular track frame 21, and performing primary adjustment on the position of the jack;
s4, rotating a hand wheel 333 to drive the vertical threaded column 32 to descend, lowering the jack 5 placed on a jack support rotating shaft 374 downwards, meanwhile, rotating the outer trolley 36, the inner trolley 37, the main rail 35 and the bottom plate through the vertical threaded column 32, the threaded sleeve 33 and the thrust ball bearing 332 to roughly adjust the angle of the jack, and then screwing the locking rod 331 to lock the vertical threaded column 32;
s5, checking the distance between the jack 5 and the tensioning position, unfolding the lengthened track 30 by rotating the lengthened track 30 along the hinge shaft 38 to splice the lengthened track 30 with the main track 35 to prolong the track where the outer trolley 36 runs, taking down the additional connecting plate 344 and transversely connecting the additional connecting plate to the outer ends of the two lengthened tracks, and respectively connecting and fixing the two ends of the additional connecting plate with the outer ends of the lengthened tracks by using connecting screws 301 to prevent the lengthened tracks from being scattered after the lengthened track 30 is spliced with the main track 35, wherein the outer trolley 36 can move in the lengthened track 30 and the main track 35; according to the distance between the jack 5 and the tensioning position, the outer trolley 36 can be pushed to enlarge the movement range of the jack, meanwhile, the outer trolley carriage 361 of the outer trolley 36 serves as a track of the inner trolley 37, and the inner trolley 37 can be pushed to further enlarge the movement range of the jack, so that the jack is close to the tensioning position; the precision adjustment of the jack angle can be carried out through the jack support rotating shaft 374 and the jack connecting frame 5 a;
and S6, repeating the steps to enable the jack 5 to be aligned to the anchorage 7 at the tensioning position, and finishing the lifting and positioning work of the jack.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (5)
1. A jack lifting device is characterized by comprising a walking bracket system (1), a translation system (2) arranged at the outer side of the walking bracket system, and a lifting system (3) connected with the translation system;
the walking support system (1) comprises a supporting frame (11) which is welded and connected by metal members and is in a three-dimensional rectangular shape, four vertical rods (12) welded in four corners of a bearing frame and universal wheels (13) arranged at the bottom ends of the vertical rods;
the translation system (2) comprises a rectangular track frame (21) arranged on the outer side of the support frame and a translation trolley (22) which is arranged in the rectangular track frame and can reciprocate along an upper track and a lower track; the top frame and the bottom frame of the rectangular track frame (21) are provided with track grooves with opposite notches; the translational trolley comprises a rectangular frame (221), upright rollers (222) respectively arranged on two sides of the outer sides of an upper beam and a lower beam of the rectangular frame, and flat rollers (223) respectively arranged at the top ends and the bottom ends of upright columns on two sides of the rectangular frame; the vertical roller (222) and the horizontal roller (223) are arranged in the track groove of the rectangular track frame; the middle parts of an upper beam and a lower beam of the rectangular frame are welded with outwards extending connecting clamping plates (224);
the lifting system (3) comprises a base (31), a vertical threaded column (32) arranged on the base, an internal threaded sleeve (33) sleeved on the vertical threaded column, a locking rod (331) inserted on the internal threaded sleeve, a hand wheel (333) sleeved on the vertical threaded column and positioned above the internal threaded sleeve (33), a thrust ball bearing (332) sleeved on the vertical threaded column and capable of propping against a hub of the hand wheel, a bottom plate welded on the inner side of the base, a main track (35) arranged on the bottom plate and provided with two opposite notches, an outer trolley (36) arranged in the main track and capable of walking in a reciprocating mode, and an inner trolley (37) arranged in the outer trolley and capable of walking in a reciprocating mode; the outer trolley (36) comprises a rectangular frame type carriage (361), a front outer trolley wheel shaft and a rear outer trolley wheel shaft (362) which are arranged at the bottom of the carriage, and outer trolley wheels (363) which are arranged at two ends of the outer trolley wheel shaft, wherein carriage frames at two sides of the carriage are channel steel parts with opposite notches, the outer trolley wheels are assembled in a trolley main track and reciprocate along the main track, and an outer trolley limiting screw (364) is arranged at the front end of the carriage; the inner trolley (37) comprises a trolley body (371), a front inner trolley wheel shaft (372) and a rear inner trolley wheel shaft (372) which are arranged at the bottom of the trolley body and inner trolley wheels (373) which are arranged at two ends of the inner trolley wheel shafts, the inner trolley wheels are assembled in grooves of box frames at two sides of a carriage of the outer trolley and move in a reciprocating manner along the box frames, and a jack support rotating shaft (374) is arranged at the top of the front end of the trolley body; the front end of the bottom plate is provided with an anti-derailment blocking bolt (39); the internal thread sleeve (33) is welded with an upper connecting clamping plate (224) and a lower connecting clamping plate (224) of the translation system.
2. A jack-lifting equipment according to claim 1 wherein an elongate rail (30) is pivotally connected to the outer end of the main rail (35) by a hinge (38); the base plate comprises a main base plate (341) and a middle connecting plate (342) which are laid at intervals and used for mounting the main track, the main base plate (341) is provided with an overlapping section (343) extending out of the main track, the middle connecting plate (342) is positioned at the bottom of the outer end of the main track, and when the lengthened track (30) rotates to be attached to the main track back to back, the lengthened track is fixed on the overlapping section (343) through a connecting screw (301); an additional connecting plate (344) is attached to the bottom of the elongated rails by connecting screws for connecting and stabilizing the two elongated rails when the elongated rails are unfolded.
3. A jack lift device according to claim 1 or 2, characterised in that a support steel frame (111) is welded to the inside of the top surface of the support frame (11).
4. A method of lifting a jack lift device as claimed in claim 1 wherein the method comprises the steps of:
s1, during prestress tensioning construction of an upper bridge structure, a jack oil pump (4) to be used is installed on an oil pump support (4a) welded to the outer side of a supporting frame (11), a jack (5) is installed on a jack supporting rotating shaft (374) of a lifting system (3) through a jack connecting frame (5a) with a top plate, universal wheels (13) of a walking support system (1) are placed on a bridge (6), a translation system (2) and the lifting system (3) are suspended outside the bridge, and a bottom plate, a rail, a trolley and a supported jack mounted by the bottom plate extend to the lower side of the bridge;
s2, pushing the walking support system (1), enabling the universal wheels (13) to rotate, and enabling the whole lifting equipment to run to a construction position along the bridge surface;
s3, pushing the translation trolley (22) to move along the rectangular track frame (21) to perform primary adjustment on the position of the jack;
s4, rotating a hand wheel (333) to drive the vertical threaded column (32) to descend, placing the jack (5) placed on the jack support rotating shaft downwards, meanwhile, rotating the outer trolley (36), the inner trolley (37), the main rail (35) and the bottom plate through the vertical threaded column (32), the threaded sleeve (33) and the thrust ball bearing (332) to roughly adjust the angle of the jack, and then screwing the locking rod (331) to lock the vertical threaded column (32);
s5, pushing an outer trolley (36) to move along a main track (35) according to the distance between the jack (5) and a tensioning position, and meanwhile, taking an outer trolley carriage (361) of the outer trolley as a track of an inner trolley (37) and pushing the inner trolley to further enlarge the movement range of the jack; the precision adjustment of the jack angle can be carried out through the jack support rotating shaft (374) and the jack connecting frame (5 a);
and S6, repeating the steps to enable the jack (5) to be aligned to an anchorage device (7) at the tensioning position, and completing the lifting and positioning work of the jack.
5. The lifting method of a jack-lift facility according to claim 4, wherein in step S5, the extension rail (30) is rotated along the hinge shaft (38) to unfold the extension rail (30), and the extension rail is spliced with the main rail (35) to extend the rail on which the outer cart (36) travels; after the lengthened tracks are spliced with the main tracks, the additional connecting plate (344) is taken down and transversely connected to the outer ends of the two lengthened tracks, and the two ends of the additional connecting plate are respectively connected and fixed with the outer ends of the lengthened tracks through connecting screws (301) so as to prevent the lengthened tracks from being scattered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010632836.9A CN111676830A (en) | 2020-07-02 | 2020-07-02 | Jack lifting equipment and lifting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010632836.9A CN111676830A (en) | 2020-07-02 | 2020-07-02 | Jack lifting equipment and lifting method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111676830A true CN111676830A (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010632836.9A Pending CN111676830A (en) | 2020-07-02 | 2020-07-02 | Jack lifting equipment and lifting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008058A (en) * | 2022-08-08 | 2022-09-06 | 中国能源建设集团山西电力建设有限公司 | Butt welding method for medium and large caliber metal steel pipe |
-
2020
- 2020-07-02 CN CN202010632836.9A patent/CN111676830A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008058A (en) * | 2022-08-08 | 2022-09-06 | 中国能源建设集团山西电力建设有限公司 | Butt welding method for medium and large caliber metal steel pipe |
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